#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
    int a = 0, b = 0, c = 0;
    scanf("%d %d %d", &a, &b, &c);
    {
        if (a + b > c && a + c > b && b + c > a)
        {
            if (a == b && b == c)
            {
                printf("Equilateral triangle!\n");
            }
            else if (a == b || b == c || a == c)
            {
                printf("Isosceles triangle!\n");
            }
            else
            {
                printf("Ordinary triangle!\n");
            }
        }
        else
        {
            printf("Not a triangle!\n");
        }
    }
    return 0;
}